public class Exam3_1 {
	public static void main(String args[ ]) {
		char a1='十',a2='点',a3='进',a4='攻';
		char secret ='A';
		a1 = (char)(a1^secret);
		a2 = (char)(a2^secret);
		a3 = (char)(a3^secret);
		a4 = (char)(a4^secret);
		System.out.println("密文:"+a1+a2+a3+a4);
		a1 = (char)(a1^secret);
		a2 = (char)(a2^secret);
		a3 = (char)(a3^secret);
		a4 = (char)(a4^secret);
		System.out.println("明文:"+a1+a2+a3+a4);
	}
}

